Improved machine for boarding- leather



To all to wham these presents shall come:

- -JOSEPHWARSONHILDRETH, or Boston, MASSACHUSETTS.

Letters Patent Zvo. 1o4,454,mmz June 21, 1870.

mrnoven MACHINE ron BOARDING LEATHER,

The Schedule referred. to in these Letters Patent and making part of the same Be it known that I, JosurH WAns N Hrnnniirn, of Boston, n the county of Suflolk and State of fllv lassachusetts, have made an invention of a new yand useful Improvment in lVIaehinery for Boarding Leather, so called; and do hereby declare the following, to be a full, clear, and exact description there-' a of, due reference being had to the accompanying I drlzlriwkilug making part of this specification, andin w c o i Figure 1 is a perspective representation, and

'h igure 2 an elevation of amachine embodying my mprovements. r

The object of my invention is to produce a motion to the boarding instrument more nearly approximating to that of human manipulation, by which a much better action is exerted upon theleather than by any machinery heretofore in use. a a

To this end, the reciprocating carriage, which carries the boarding device, is supported-"and slides upon curved ways suspended above the table, by which means theboarding instrumentality is causedto travel to and fro of the surface of the. leather ina path approximatiug to a sector of a circle, this motion having. been found in practice the one best calculated'to por-t. duce the most perfect surfaceupon such leather.

In the drawing hereinbefore alluded to as ,accompanying this specification, andwhich illustrates my invention a'denotes a gallows-frame, of which I) is the upright post, and i p c the horizontal arm which surmounts the operating tablet, to be hereinafter explained.

l To one side of this arm '0 a curved plate or guide,

i, ll, in'lthe form of an inverted arch or segment of acirole, is aflixed, while sliding upon this plate or way is thecarriage which carries the boarding instrument.

This carriage is represented at e as composed of e a base-plate, fland two end uprights y g, substautially. after the manner ofthe head-stock of an ordia nary turning-lathe, the boarding instrument or device i which is'usually simply apiece of cork, being secured I to the under side of the carriage c, as represented at .h in the drawing. v y a The carriage 0 may be provided with anti-friction rollers-ass, means of suspension from the bar (I, or it may simply slide thereupon after the manner of the cross head of a steam-engine.

Apitman, c,- conneots one end of the man-a e =e with the wrist-pin j of a crank-wheel, k, mounted upon thepos't b, by which means to and fro rcciprocations of the carriage upon its suspensory are of:

v Thesupport for the leather, while undergoing the 3 w boarding process, is-exhibited at lasa flat tablet mounted upon a table, m, the connection between the two being preferably an; elastic or yielding one, and which may be effected in a variety of ways. The table on is supported upon the topof a'post, n, and upon which it freely slides, this post being erected upon the floor of the structure in which the machine is situated, or upon any suitable. foundation. r

A sleeve, 0, slides freely upon or about the lower part of the post, and is connected with the 'tahlem by oblique braces or feet p, which are secured to the two, as represented, this sleeve'and the feet serving as an economical means of steadying the sertical motion of the table.

The post a is also braced in a suitable manner,

while an elastic washer may, if considered desirable,

be interposed between the, sleeve 0.

A lover or treadle, q, is fulcrumed to a post, 1', erected upon the floor or foundation of the building, and adjacent to the post a, the inner end of thistreadlc being furcated' and embracing the sleeve 0, beforementioned, the whole being so arranged that, by means 'of the treadle or lever q, elevations or depressions of the table'and its tablet upon the post 11, and to-- ward oraway from the boarding-tool, may be easily effected.

,The mode of suspending the boarding-tool carriage, as hereinbefore explained, enables the angles of incidence and departure of the said tool, with respect to the leather, to be described in such a direction as to impinge upon and leave the same in a gradual and easy. curve, and without the abruptau d injurious impact now common to machines of this naturc.

I am a\vare that a pendulistic motion has been imparted to the boarding-tool by suspendingit from a pivot, and I do not claim broadly causing the tool' to vibrate in a curved path.

The objections to the use of a pivot are that, in order to obtain the gradual and easy approach of. the tool tot-he leather, the arc of the circle in which it swings must be so large that the axismust neccssarily be removed a considerable distance from the tabio, and the tool is then suspended from the end of a long swinging radius or arm, which is likely to fail in properly supporting andsteadying the tool; and again, the tool, in such'case, must always swing in the arc of a circle; but by my improvement, thatis to say, by the employment of the curved guide or way upon which the tool slides, the to'ol-is-supported and braced at a point immediately above and in proximity to the leather, the curve may be as gradual as desired without increasing the size of the machine, and,

instead of being an areof acir'cle, it may be a para;

bolic or other suitable curve.

I would remark that, the upper surface of the tahsupported by and moviug in or upon a curved guide let I is to he provided with a plate of cork, after the or way, 11, substantially as and for the purposes set manner of leather-boardingmachines now in general forth.

use. JOSEPH WARSON HILDRE'IH.

What I claim, and desire to secure by Letters Patcut, is Witnesses:

- The combination, with the leather-supporting bed FRED. CURTIS,

or tablet, of the reciprocating boarding-tool carriage, E. GRIFFITH. 

